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About

Plugin to show the recent or historic activity widget from a specific user, or generic for the whole site. Enter a user ID and select the site. The random mode is great to discover what's going on the network.

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After hanging around at WordPress Answers, one learns a lot in plugin development. Special thanks to the austro-german wing, kaiser and toscho.
And, surely enough, Stack Overflow for all the PHP/CSS/jQuery needs a programmer may have.